There are other concerns if trying to trouble shoot with live round. If the lpk or lower is out of spec, hammer can folllow without pulling the trigger. Is the firing pin free floating or sticking with metal shaving? Mil-spec primer are harder to prevent slamfire, so it is uncommon, unless u'r unlucky. Ar firing pin hits the primer all the time when the round is chambered, just not hard enough. Chk it next time at the range for that small dent.

AD/ND does happen even with experienced shooter. I know plenty of folks with holes in the ceiling, wall, and floors.

Do a search here and see how many threads you find with I just had an AD with my AR while loading a round in the chamber....

__________________"Men sleep peacefully in their beds at night because rough men stand ready to do violence on their behalf."

Don't even use the charging handle to chamber a round. Just use it to pull the bolt back, use the bolt hold-open to hold the bolt back, push the charging handle forward and locked, and then hit the bolt hold-open to chamber a round.

This ^

In all my shooting of my AR I have never used the charging handle to chamber a round. When I am shooting the bolt stays back any way on the last round so it is ready to be released on the next mag. Also, at the range they want actions to be open and bolts back so I do that as I am setting up my station when I get there. I always wondered why people charge with the handle.

Maybe in the service you don't want to walk around with a round chambered, but at the range, for me, this never comes up.